More than $4 million was poured into the fight against the Queensland fruit fly scare in Auckland between February and June 15. But Biosecurity New Zealand told the Herald the cost was a necessary evil.

"[That] sounds like a lot to spend in a short space of time but [not] when you consider what you're protecting," spokeswoman Dr Catherine Duthie said.

"We're talking about the protection of a multimillion-dollar industry, probably costs into the billions, that could have been affected."

Figures obtained from the Ministry for Primary Industries through the Official Information Act revealed 13 fruit flies were found at

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